/*
Copyright (C) 1996-1997 Id Software, Inc.

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

*/
// net_main.c

#include "quakedef.h"
#include "net_vcr.h"

qsocket_t	*net_activeSockets = NULL;
qsocket_t	*net_freeSockets = NULL;
int			net_numsockets = 0;

qboolean	serialAvailable = false;
qboolean	ipxAvailable = false;
qboolean	tcpipAvailable = false;

int			net_hostport;
int			DEFAULTnet_hostport = 26000;

char		my_ipx_address[NET_NAMELEN];
char		my_tcpip_address[NET_NAMELEN];

void (*GetComPortConfig) (int portNumber, int *port, int *irq, int *baud, qboolean *useModem);
void (*SetComPortConfig) (int portNumber, int port, int irq, int baud, qboolean useModem);
void (*GetModemConfig) (int portNumber, char *dialType, char *clear, char *init, char *hangup);
void (*SetModemConfig) (int portNumber, char *dialType, char *clear, char *init, char *hangup);

static qboolean	listening = false;

qboolean	slistInProgress = false;
qboolean	slistSilent = false;
qboolean	slistLocal = true;
static double	slistStartTime;
static int		slistLastShown;

static void Slist_Send(void);
static void Slist_Poll(void);
PollProcedure	slistSendProcedure = {NULL, 0.0, Slist_Send};
PollProcedure	slistPollProcedure = {NULL, 0.0, Slist_Poll};


sizebuf_t		net_message;
int				net_activeconnections = 0;

int messagesSent = 0;
int messagesReceived = 0;
int unreliableMessagesSent = 0;
int unreliableMessagesReceived = 0;

cvar_t	net_messagetimeout = {"net_messagetimeout","300"};
cvar_t	hostname = {"hostname", "UNNAMED"};

qboolean	configRestored = false;
cvar_t	config_com_port = {"_config_com_port", "0x3f8", true};
cvar_t	config_com_irq = {"_config_com_irq", "4", true};
cvar_t	config_com_baud = {"_config_com_baud", "57600", true};
cvar_t	config_com_modem = {"_config_com_modem", "1", true};
cvar_t	config_modem_dialtype = {"_config_modem_dialtype", "T", true};
cvar_t	config_modem_clear = {"_config_modem_clear", "ATZ", true};
cvar_t	config_modem_init = {"_config_modem_init", "", true};
cvar_t	config_modem_hangup = {"_config_modem_hangup", "AT H", true};

#ifdef IDGODS
cvar_t	idgods = {"idgods", "0"};
#endif

int	vcrFile = -1;
qboolean recording = false;

// these two macros are to make the code more readable
#define sfunc	net_drivers[sock->driver]
#define dfunc	net_drivers[net_driverlevel]

int	net_driverlevel;


double			net_time;

double SetNetTime(void)
{
    net_time = Sys_FloatTime();
    return net_time;
}


/*
===================
NET_NewQSocket

Called by drivers when a new communications endpoint is required
The sequence and buffer fields will be filled in properly
===================
*/
qsocket_t *NET_NewQSocket (void)
{
    qsocket_t	*sock;

    if (net_freeSockets == NULL)
        return NULL;

    if (net_activeconnections >= svs.maxclients)
        return NULL;

    // get one from free list
    sock = net_freeSockets;
    net_freeSockets = sock->next;

    // add it to active list
    sock->next = net_activeSockets;
    net_activeSockets = sock;

    sock->disconnected = false;
    sock->connecttime = net_time;
    Q_strcpy (sock->address,"UNSET ADDRESS");
    sock->driver = net_driverlevel;
    sock->socket = 0;
    sock->driverdata = NULL;
    sock->canSend = true;
    sock->sendNext = false;
    sock->lastMessageTime = net_time;
    sock->ackSequence = 0;
    sock->sendSequence = 0;
    sock->unreliableSendSequence = 0;
    sock->sendMessageLength = 0;
    sock->receiveSequence = 0;
    sock->unreliableReceiveSequence = 0;
    sock->receiveMessageLength = 0;

    return sock;
}


void NET_FreeQSocket(qsocket_t *sock)
{
    qsocket_t	*s;

    // remove it from active list
    if (sock == net_activeSockets)
        net_activeSockets = net_activeSockets->next;
    else
    {
        for (s = net_activeSockets; s; s = s->next)
            if (s->next == sock)
            {
                s->next = sock->next;
                break;
            }
        if (!s)
            Sys_Error ("NET_FreeQSocket: not active\n");
    }

    // add it to free list
    sock->next = net_freeSockets;
    net_freeSockets = sock;
    sock->disconnected = true;
}


static void NET_Listen_f (void)
{
    if (Cmd_Argc () != 2)
    {
        Con_Printf ("\"listen\" is \"%u\"\n", listening ? 1 : 0);
        return;
    }

    listening = Q_atoi(Cmd_Argv(1)) ? true : false;

    for (net_driverlevel=0 ; net_driverlevel<net_numdrivers; net_driverlevel++)
    {
        if (net_drivers[net_driverlevel].initialized == false)
            continue;
        dfunc.Listen (listening);
    }
}


static void MaxPlayers_f (void)
{
    int 	n;

    if (Cmd_Argc () != 2)
    {
        Con_Printf ("\"maxplayers\" is \"%u\"\n", svs.maxclients);
        return;
    }

    if (sv.active)
    {
        Con_Printf ("maxplayers can not be changed while a server is running.\n");
        return;
    }

    n = Q_atoi(Cmd_Argv(1));
    if (n < 1)
        n = 1;
    if (n > svs.maxclientslimit)
    {
        n = svs.maxclientslimit;
        Con_Printf ("\"maxplayers\" set to \"%u\"\n", n);
    }

    if ((n == 1) && listening)
        Cbuf_AddText ("listen 0\n");

    if ((n > 1) && (!listening))
        Cbuf_AddText ("listen 1\n");

    svs.maxclients = n;
    if (n == 1)
        Cvar_Set ("deathmatch", "0");
    else
        Cvar_Set ("deathmatch", "1");
}


static void NET_Port_f (void)
{
    int 	n;

    if (Cmd_Argc () != 2)
    {
        Con_Printf ("\"port\" is \"%u\"\n", net_hostport);
        return;
    }

    n = Q_atoi(Cmd_Argv(1));
    if (n < 1 || n > 65534)
    {
        Con_Printf ("Bad value, must be between 1 and 65534\n");
        return;
    }

    DEFAULTnet_hostport = n;
    net_hostport = n;

    if (listening)
    {
        // force a change to the new port
        Cbuf_AddText ("listen 0\n");
        Cbuf_AddText ("listen 1\n");
    }
}


static void PrintSlistHeader(void)
{
    Con_Printf("Server          Map             Users\n");
    Con_Printf("--------------- --------------- -----\n");
    slistLastShown = 0;
}


static void PrintSlist(void)
{
    int n;

    for (n = slistLastShown; n < hostCacheCount; n++)
    {
        if (hostcache[n].maxusers)
            Con_Printf("%-15.15s %-15.15s %2u/%2u\n", hostcache[n].name, hostcache[n].map, hostcache[n].users, hostcache[n].maxusers);
        else
            Con_Printf("%-15.15s %-15.15s\n", hostcache[n].name, hostcache[n].map);
    }
    slistLastShown = n;
}


static void PrintSlistTrailer(void)
{
    if (hostCacheCount)
        Con_Printf("== end list ==\n\n");
    else
        Con_Printf("No Quake servers found.\n\n");
}


void NET_Slist_f (void)
{
    if (slistInProgress)
        return;

    if (! slistSilent)
    {
        Con_Printf("Looking for Quake servers...\n");
        PrintSlistHeader();
    }

    slistInProgress = true;
    slistStartTime = Sys_FloatTime();

    SchedulePollProcedure(&slistSendProcedure, 0.0);
    SchedulePollProcedure(&slistPollProcedure, 0.1);

    hostCacheCount = 0;
}


static void Slist_Send(void)
{
    for (net_driverlevel=0; net_driverlevel < net_numdrivers; net_driverlevel++)
    {
        if (!slistLocal && net_driverlevel == 0)
            continue;
        if (net_drivers[net_driverlevel].initialized == false)
            continue;
        dfunc.SearchForHosts (true);
    }

    if ((Sys_FloatTime() - slistStartTime) < 0.5)
        SchedulePollProcedure(&slistSendProcedure, 0.75);
}


static void Slist_Poll(void)
{
    for (net_driverlevel=0; net_driverlevel < net_numdrivers; net_driverlevel++)
    {
        if (!slistLocal && net_driverlevel == 0)
            continue;
        if (net_drivers[net_driverlevel].initialized == false)
            continue;
        dfunc.SearchForHosts (false);
    }

    if (! slistSilent)
        PrintSlist();

    if ((Sys_FloatTime() - slistStartTime) < 1.5)
    {
        SchedulePollProcedure(&slistPollProcedure, 0.1);
        return;
    }

    if (! slistSilent)
        PrintSlistTrailer();
    slistInProgress = false;
    slistSilent = false;
    slistLocal = true;
}


/*
===================
NET_Connect
===================
*/

int hostCacheCount = 0;
hostcache_t hostcache[HOSTCACHESIZE];

qsocket_t *NET_Connect (char *host)
{
    qsocket_t		*ret;
    int				n;
    int				numdrivers = net_numdrivers;

    SetNetTime();

    if (host && *host == 0)
        host = NULL;

    if (host)
    {
        if (Q_strcasecmp (host, "local") == 0)
        {
            numdrivers = 1;
            goto JustDoIt;
        }

        if (hostCacheCount)
        {
            for (n = 0; n < hostCacheCount; n++)
                if (Q_strcasecmp (host, hostcache[n].name) == 0)
                {
                    host = hostcache[n].cname;
                    break;
                }
            if (n < hostCacheCount)
                goto JustDoIt;
        }
    }

    slistSilent = host ? true : false;
    NET_Slist_f ();

    while(slistInProgress)
        NET_Poll();

    if (host == NULL)
    {
        if (hostCacheCount != 1)
            return NULL;
        host = hostcache[0].cname;
        Con_Printf("Connecting to...\n%s @ %s\n\n", hostcache[0].name, host);
    }

    if (hostCacheCount)
        for (n = 0; n < hostCacheCount; n++)
            if (Q_strcasecmp (host, hostcache[n].name) == 0)
            {
                host = hostcache[n].cname;
                break;
            }

JustDoIt:
    for (net_driverlevel=0 ; net_driverlevel<numdrivers; net_driverlevel++)
    {
        if (net_drivers[net_driverlevel].initialized == false)
            continue;
        ret = dfunc.Connect (host);
        if (ret)
            return ret;
    }

    if (host)
    {
        Con_Printf("\n");
        PrintSlistHeader();
        PrintSlist();
        PrintSlistTrailer();
    }

    return NULL;
}


/*
===================
NET_CheckNewConnections
===================
*/

struct
{
    double	time;
    int		op;
    long	session;
} vcrConnect;

qsocket_t *NET_CheckNewConnections (void)
{
    qsocket_t	*ret;

    SetNetTime();

    for (net_driverlevel=0 ; net_driverlevel<net_numdrivers; net_driverlevel++)
    {
        if (net_drivers[net_driverlevel].initialized == false)
            continue;
        if (net_driverlevel && listening == false)
            continue;
        ret = dfunc.CheckNewConnections ();
        if (ret)
        {
            if (recording)
            {
                vcrConnect.time = host_time;
                vcrConnect.op = VCR_OP_CONNECT;
                vcrConnect.session = (long)ret;
                Sys_FileWrite (vcrFile, &vcrConnect, sizeof(vcrConnect));
                Sys_FileWrite (vcrFile, ret->address, NET_NAMELEN);
            }
            return ret;
        }
    }

    if (recording)
    {
        vcrConnect.time = host_time;
        vcrConnect.op = VCR_OP_CONNECT;
        vcrConnect.session = 0;
        Sys_FileWrite (vcrFile, &vcrConnect, sizeof(vcrConnect));
    }

    return NULL;
}

/*
===================
NET_Close
===================
*/
void NET_Close (qsocket_t *sock)
{
    if (!sock)
        return;

    if (sock->disconnected)
        return;

    SetNetTime();

    // call the driver_Close function
    sfunc.Close (sock);

    NET_FreeQSocket(sock);
}


/*
=================
NET_GetMessage

If there is a complete message, return it in net_message

returns 0 if no data is waiting
returns 1 if a message was received
returns -1 if connection is invalid
=================
*/

struct
{
    double	time;
    int		op;
    long	session;
    int		ret;
    int		len;
} vcrGetMessage;

extern void PrintStats(qsocket_t *s);

int	NET_GetMessage (qsocket_t *sock)
{
    int ret;

    if (!sock)
        return -1;

    if (sock->disconnected)
    {
        Con_Printf("NET_GetMessage: disconnected socket\n");
        return -1;
    }

    SetNetTime();

    ret = sfunc.QGetMessage(sock);

    // see if this connection has timed out
    if (ret == 0 && sock->driver)
    {
        /*
        RFC: Why doesn't this work!!!  It's the same... or not??
        Since when I compile it it evaluates the if body even if it's a smaller number...

        if ((net_time - sock->lastMessageTime) > (double)net_messagetimeout.value)
        {
        	Con_Printf("*** Connection timed out after %f s of inactivity (max is %f)\n",delta,net_messagetimeout.value);
        	//NET_Close(sock);
        	//return -1;
        }
        */
        float delta = (net_time - sock->lastMessageTime);
        if (delta > net_messagetimeout.value)
        {
            Con_Printf("*** Connection timed out after %f s of inactivity (max is %f)\n",delta,net_messagetimeout.value);
            NET_Close(sock);
            return -1;
        }
    }


    if (ret > 0)
    {
        if (sock->driver)
        {
            sock->lastMessageTime = net_time;
            if (ret == 1)
                messagesReceived++;
            else if (ret == 2)
                unreliableMessagesReceived++;
        }

        if (recording)
        {
            vcrGetMessage.time = host_time;
            vcrGetMessage.op = VCR_OP_GETMESSAGE;
            vcrGetMessage.session = (long)sock;
            vcrGetMessage.ret = ret;
            vcrGetMessage.len = net_message.cursize;
            Sys_FileWrite (vcrFile, &vcrGetMessage, 24);
            Sys_FileWrite (vcrFile, net_message.data, net_message.cursize);
        }
    }
    else
    {
        if (recording)
        {
            vcrGetMessage.time = host_time;
            vcrGetMessage.op = VCR_OP_GETMESSAGE;
            vcrGetMessage.session = (long)sock;
            vcrGetMessage.ret = ret;
            Sys_FileWrite (vcrFile, &vcrGetMessage, 20);
        }
    }

    return ret;
}


/*
==================
NET_SendMessage

Try to send a complete length+message unit over the reliable stream.
returns 0 if the message cannot be delivered reliably, but the connection
		is still considered valid
returns 1 if the message was sent properly
returns -1 if the connection died
==================
*/
struct
{
    double	time;
    int		op;
    long	session;
    int		r;
} vcrSendMessage;

int NET_SendMessage (qsocket_t *sock, sizebuf_t *data)
{
    int		r;

    if (!sock)
        return -1;

    if (sock->disconnected)
    {
        Con_Printf("NET_SendMessage: disconnected socket\n");
        return -1;
    }

    SetNetTime();
    r = sfunc.QSendMessage(sock, data);
    if (r == 1 && sock->driver)
        messagesSent++;

    if (recording)
    {
        vcrSendMessage.time = host_time;
        vcrSendMessage.op = VCR_OP_SENDMESSAGE;
        vcrSendMessage.session = (long)sock;
        vcrSendMessage.r = r;
        Sys_FileWrite (vcrFile, &vcrSendMessage, 20);
    }

    return r;
}


int NET_SendUnreliableMessage (qsocket_t *sock, sizebuf_t *data)
{
    int		r;

    if (!sock)
        return -1;

    if (sock->disconnected)
    {
        Con_Printf("NET_SendMessage: disconnected socket\n");
        return -1;
    }

    SetNetTime();
    r = sfunc.SendUnreliableMessage(sock, data);
    if (r == 1 && sock->driver)
        unreliableMessagesSent++;

    if (recording)
    {
        vcrSendMessage.time = host_time;
        vcrSendMessage.op = VCR_OP_SENDMESSAGE;
        vcrSendMessage.session = (long)sock;
        vcrSendMessage.r = r;
        Sys_FileWrite (vcrFile, &vcrSendMessage, 20);
    }

    return r;
}


/*
==================
NET_CanSendMessage

Returns true or false if the given qsocket can currently accept a
message to be transmitted.
==================
*/
qboolean NET_CanSendMessage (qsocket_t *sock)
{
    int		r;

    if (!sock)
        return false;

    if (sock->disconnected)
        return false;

    SetNetTime();

    r = sfunc.CanSendMessage(sock);

    if (recording)
    {
        vcrSendMessage.time = host_time;
        vcrSendMessage.op = VCR_OP_CANSENDMESSAGE;
        vcrSendMessage.session = (long)sock;
        vcrSendMessage.r = r;
        Sys_FileWrite (vcrFile, &vcrSendMessage, 20);
    }

    return r;
}


int NET_SendToAll(sizebuf_t *data, int blocktime)
{
    double		start;
    int			i;
    int			count = 0;
    qboolean	state1 [MAX_SCOREBOARD];
    qboolean	state2 [MAX_SCOREBOARD];

    for (i=0, host_client = svs.clients ; i<svs.maxclients ; i++, host_client++)
    {
        if (!host_client->netconnection)
            continue;
        if (host_client->active)
        {
            if (host_client->netconnection->driver == 0)
            {
                NET_SendMessage(host_client->netconnection, data);
                state1[i] = true;
                state2[i] = true;
                continue;
            }
            count++;
            state1[i] = false;
            state2[i] = false;
        }
        else
        {
            state1[i] = true;
            state2[i] = true;
        }
    }

    start = Sys_FloatTime();
    while (count)
    {
        count = 0;
        for (i=0, host_client = svs.clients ; i<svs.maxclients ; i++, host_client++)
        {
            if (! state1[i])
            {
                if (NET_CanSendMessage (host_client->netconnection))
                {
                    state1[i] = true;
                    NET_SendMessage(host_client->netconnection, data);
                }
                else
                {
                    NET_GetMessage (host_client->netconnection);
                }
                count++;
                continue;
            }

            if (! state2[i])
            {
                if (NET_CanSendMessage (host_client->netconnection))
                {
                    state2[i] = true;
                }
                else
                {
                    NET_GetMessage (host_client->netconnection);
                }
                count++;
                continue;
            }
        }
        if ((Sys_FloatTime() - start) > blocktime)
            break;
    }
    return count;
}


//=============================================================================

/*
====================
NET_Init
====================
*/

void NET_Init (void)
{
    int			i;
    int			controlSocket;
    qsocket_t	*s;

    if (COM_CheckParm("-playback"))
    {
        net_numdrivers = 1;
        net_drivers[0].Init = VCR_Init;
    }

    if (COM_CheckParm("-record"))
        recording = true;

    i = COM_CheckParm ("-port");
    if (!i)
        i = COM_CheckParm ("-udpport");
    if (!i)
        i = COM_CheckParm ("-ipxport");

    if (i)
    {
        if (i < com_argc-1)
            DEFAULTnet_hostport = Q_atoi (com_argv[i+1]);
        else
            Sys_Error ("NET_Init: you must specify a number after -port");
    }
    net_hostport = DEFAULTnet_hostport;

    if (COM_CheckParm("-listen") || cls.state == ca_dedicated)
        listening = true;
    net_numsockets = svs.maxclientslimit;
    if (cls.state != ca_dedicated)
        net_numsockets++;

    SetNetTime();

    for (i = 0; i < net_numsockets; i++)
    {
        s = (qsocket_t *)Hunk_AllocName(sizeof(qsocket_t), "qsocket");
        s->next = net_freeSockets;
        net_freeSockets = s;
        s->disconnected = true;
    }

    // allocate space for network message buffer
    SZ_Alloc (&net_message, NET_MAXMESSAGE);

    Cvar_RegisterVariable (&net_messagetimeout, NULL);
    Cvar_RegisterVariable (&hostname, NULL);
    Cvar_RegisterVariable (&config_com_port, NULL);
    Cvar_RegisterVariable (&config_com_irq, NULL);
    Cvar_RegisterVariable (&config_com_baud, NULL);
    Cvar_RegisterVariable (&config_com_modem, NULL);
    Cvar_RegisterVariable (&config_modem_dialtype, NULL);
    Cvar_RegisterVariable (&config_modem_clear, NULL);
    Cvar_RegisterVariable (&config_modem_init, NULL);
    Cvar_RegisterVariable (&config_modem_hangup, NULL);
#ifdef IDGODS
    Cvar_RegisterVariable (&idgods, NULL);
#endif

    Cmd_AddCommand ("slist", NET_Slist_f);
    Cmd_AddCommand ("listen", NET_Listen_f);
    Cmd_AddCommand ("maxplayers", MaxPlayers_f);
    Cmd_AddCommand ("port", NET_Port_f);

    // initialize all the drivers
    for (net_driverlevel=0 ; net_driverlevel<net_numdrivers ; net_driverlevel++)
    {
        controlSocket = net_drivers[net_driverlevel].Init();
        if (controlSocket == -1)
            continue;
        net_drivers[net_driverlevel].initialized = true;
        net_drivers[net_driverlevel].controlSock = controlSocket;
        if (listening)
            net_drivers[net_driverlevel].Listen (true);
    }

    if (*my_ipx_address)
        Con_DPrintf("IPX address %s\n", my_ipx_address);
    if (*my_tcpip_address)
        Con_DPrintf("TCP/IP address %s\n", my_tcpip_address);
}

/*
====================
NET_Shutdown
====================
*/

void		NET_Shutdown (void)
{
    qsocket_t	*sock;

    SetNetTime();

    for (sock = net_activeSockets; sock; sock = sock->next)
        NET_Close(sock);

//
// shutdown the drivers
//
    for (net_driverlevel = 0; net_driverlevel < net_numdrivers; net_driverlevel++)
    {
        if (net_drivers[net_driverlevel].initialized == true)
        {
            net_drivers[net_driverlevel].Shutdown ();
            net_drivers[net_driverlevel].initialized = false;
        }
    }

    if (vcrFile != -1)
    {
        Con_Printf ("Closing vcrfile.\n");
        Sys_FileClose(vcrFile);
    }
}


static PollProcedure *pollProcedureList = NULL;

void NET_Poll(void)
{
    PollProcedure *pp;
    qboolean	useModem;

    if (!configRestored)
    {
        if (serialAvailable)
        {
            if (config_com_modem.value == 1.0)
                useModem = true;
            else
                useModem = false;
            SetComPortConfig (0, (int)config_com_port.value, (int)config_com_irq.value, (int)config_com_baud.value, useModem);
            SetModemConfig (0, config_modem_dialtype.string, config_modem_clear.string, config_modem_init.string, config_modem_hangup.string);
        }
        configRestored = true;
    }

    SetNetTime();

    for (pp = pollProcedureList; pp; pp = pp->next)
    {
        if (pp->nextTime > net_time)
            break;
        pollProcedureList = pp->next;
        pp->procedure(pp->arg);
    }
}


void SchedulePollProcedure(PollProcedure *proc, double timeOffset)
{
    PollProcedure *pp, *prev;

    proc->nextTime = Sys_FloatTime() + timeOffset;
    for (pp = pollProcedureList, prev = NULL; pp; pp = pp->next)
    {
        if (pp->nextTime >= proc->nextTime)
            break;
        prev = pp;
    }

    if (prev == NULL)
    {
        proc->next = pollProcedureList;
        pollProcedureList = proc;
        return;
    }

    proc->next = pp;
    prev->next = proc;
}


#ifdef IDGODS
#define IDNET	0xc0f62800

qboolean IsID(struct qsockaddr *addr)
{
    if (idgods.value == 0.0)
        return false;

    if (addr->sa_family != 2)
        return false;

    if ((BigLong(*(int *)&addr->sa_data[2]) & 0xffffff00) == IDNET)
        return true;
    return false;
}
#endif
